Lock-alarm.



L. TALAS.

LOOK ALARM.

APPLICATION FILED SEPT.12, 1907.'

Patented Oct. 6, 1908.

2 SHEETS-SHEET 1.

. WITNESSES mmvroe J t Yw ATTORNEYS n 0., wasmuaron, n. c

L. TA'LAS;

LOOK ALARM. I 900,36 APPLIO'ATION FILED SEPT. 12, 1907. :Patented Oct.6, 1908.

2 SHEETS-SHEET 2.

WITNESSES Y glfLVTO/i v V 5' x ATTORNEYS Z Tins co.,' WASHINGTON, II- c.

UNITED strains 6 Arena QFFICE.

.Lours TALAs, or New YORK, N. Y.

LOCK-ALARM.

Specification of Letters Patent.

Patented Oct. 6, 1908.

Application filed Septemberl Z, 1907. Serial No. 392,554.

To all whom it may concern: 1 Be it known that I, LOUIS TALAs, a sub ectof the King of Hungary, and a residentiof.

The invention relates generally to im provements in door-locks;and theprimaryobjects of the improvements are to' provide a lock of thischaracter which will operate audible signals when the door, to whichthis look is secured, is opened either by a key or by force.

In general terms the invention consists of a lock, havinga lock bolt,the movement of which actuates a plurality of levers, one of which actsas a stop for a hammer, located within a bell and adapted to strike thesame, when released. Means are provided, whereby the bell is operated,when a key is in serted into thekey-hole of the lock. p

The invention is illustrated in the accompanying drawings, in which tFigure 1 is a side elevation of the improved lock, the cap plate beingremovedto show the operative parts,which are in their normal positiontaken when the door to which the lock is applied is open. Fig. 2 isasimilar View, the parts being shown in a position taken when the dooris closed. Fig.- 3 is an elevation of the lock, illustrating the look asapplied to a door; Figs. 4, 5, 6 and 7 are details of construction.

Referring to the drawings, 1 represents a lock-case to which are secureda cap-plate 2' and a front-plate 3. The cap-plate 2 may be secured tothe lock-case by means of screws, screwed into the holes M of thelock-case. The lock itself is secured to the door by screws 55.

The combined locking-bolt and latch'is indicated at 6, forced forward toengage the socket 7 of the door post 8 by means of a spring 9, whichlatter rests against the combined lock-bolt and latch and against a lug10, secured to the lock-case.

The lock bolt is of the usual size, having a rectangular bolt-head and aflat plate extending into the lock, in the cap-plate 2 of which there isprovided an oblong slot 11 engaging a pin 12, which is secured to thelock bolt 6. This pin 12 protrudes through the slot 11 and carries onits outer end a knob 13, adapted to operate said lock-boltfrom the innerside of the door. The lockbolt is also provided with an oblong slot 14,engagedby a pin 14. This pin and the pin 12 support the bolt in aposition parallel with the sides of-the lock-case. The pin 14, on theother hand, serves as a stop, determining the outward movement of thebolt 6.

15 designates a bellcrank, fulcrumed at 16. The arm 17 of thisbell-crank extends along the bolt 6 andengages a bar 18, secured to thebolt 6. The free end of the bar 18 is provided with a projection 18toward the front plate of the lock case, for a purpose hereinafter to hedescribed.

19 indicates a spring, bent over a pin 20, one end of the same restsagainst the lockcase, while itsother end bears against a pin 21, carriedby the bell-crank 15, so that the normal tension of the spring holds thebellcrank against the lock-bolt 6, whereby the arm 17 engages the bar18, holding thereby the latch in the so called open position. The arm 22of the bell-crank 15 extends upward, abutting a shoulder 23 of a bar 24,sliding in guides 2525. The outer end of the bar 24 protrudes through ahole of the lock-case, so that it may be operated by the door post, whenthe door is closed. The outward movement of the bar 24 is determined bya stop 26 and a pin 27, secured to the bar, which latter is held underthe tension of a spring 28.

From the foregoing description it will be seen, that when the outer endof the bar 24 hits against the lug 29, secured to the door post 8, theshoulder 23 will operate the bell-crank 15, whereby the arm 17 releasesthe bar 18; spring 9 will thus push the bolt 6 forward, so that it willenter the socket 7 provided therefor on the door post.

The bolt 6 is provided with a projection 30, adapted to engage thetumbler 31, fulcrumed at 32 to the lock-case and held under the tensionof a spring 33, tending to press the tumbler against the bolt 6. To thetumbler is secured an auxiliary tumbler 34, one end of which ispivotally connected to the main tumbler 31, while its other end is in asimilar way secured to the lock-case.

A spindle 35 is supported in the lock-case; the inner end of the spindlecarries an arm 36 adapted to bring the tumbler 31 out of operativeconnection with the lock bolt 6. The spindle may be operated by means ofa lever 37 secured thereto and located on the outer side of thelock-case. A spring 38 rests against the lever 37, holding the same inthe position desired. The purpose of this device 36 will be hereinaftermore fully described.

The keyhole of the lock is indicated at 39, and covering the insideentrance of the keyhole is located a stem 40, so that a key cannot enterfrom the outside until the stem 40 is removed. A cylindrical extensionll is secured to the front plate 3 of the lock-case, closed at its outerend, and adapted to receive the stem 40 when pushed into the same by akey, entering from the outside. The spring 42 tends to hold the stemnear to the keyhole 39. A bar 13, having a forked end 43, rests againstthe spindle 40 and is non mally held in this position by a spring n. Thefree end of the arm 48 is engaged by a lever 45, fulcrumed at 46, andheld under the tension of the spring 47. The other arm of the lever 45is pivotally connected to a bar 48, protruding through a hole of theeasing and carrying a knob l9, so that this bar may be shifted fromoutside of the casing by means of the knob 6L9. A pin is secured to thearm 48 and protrudes through a slot 51, formed in the lock-case. Thispin normally holds against rotation a motor, such as a clock-work and ahammer 56 operated by this clock-work. On shifting the arm, the pin 50releases the pin 52 of the clock-work, allowing thereby the hammer tostrike and ring the bell 53 carried by the front plate 3 of thelock-case. The clockwork is located within the bell 53 and may be woundup by a knob 54, located outside of the casing and the bell.

Fig. 1 shows the look as it appears when the door is open.

As mentioned hereinbefore, the stem 40 covers the inside entrance of thekeyhole 39, so that the key cannot enter from the outside until theobstruction is removed. The obstruction being removed, the key lifts thetumbler 81 by means of the lever 84 and then withdraws the bolt 6 fromits socket 7. The key pushes the stem 4L0 into the cylindrical portion41 until the portion 4-0 of the stem 4-0 allows the forked end of thebar 43 to advance, whereby the lever 45 and the lever 4-8, connectedthereto, will be moved so that the pin 52 of the clock-work be releasedand the clock-work and the hammer ring the bell, indicating thereby thata key has been inserted into the keyhole or that somebody is trying bysome other means to open the door. hen the person, opening the door hasentered the room, the same may by means of the knob 49 bring the pin 50to its normal position, stopping thereby the ringing of the bell.

As shown in Fig. 2, the pins 12 and 14; allow of a further outwardmovement of the latch 6. Should therefore a person try to open the doorby means of any instrument breaking away a portion of the door post 8,then the lock bolt 6 will move forward and by means of the projection 18of the lever 18 operate levers 45 and 4:8, releasing thereby theclock-work, so that the bell will be actuated and indicate the openingof the door.

lVhat I claim is:

Ina lock alarm, the combination with a lock case having a key hole, of abolt extending into said key hole, a forked bar operatively held againstsaid bolt, a bell, a clockwork in said bell adapted to actuate a hammerfor ringing said bell, a stop-bar carrying a stop for said clock-work, alever eonnecting said stop-bar and said forked bar, and a spring keepingsaid forked bar in operative engagement with said bolt and said stopagainst said clock-work, combined and arranged in the manner and for thepurpose substantially as specified.

Signed at New York, in the county of New York and State of New York,this20th day of August, A. D. 1907.

LoUIs TALAS.

Witnesses SIGMUND Hnnzoe, S. BIRNBAUM.

